1220533116 has 96 divisors (see below), whose sum is σ = 3219578880. Its totient is φ = 356529600.

The previous prime is 1220533099. The next prime is 1220533117. The reversal of 1220533116 is 6113350221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220533117) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1550475 + ... + 1551261.

It is an arithmetic number, because the mean of its divisors is an integer number (33537280).

Almost surely, 2^1220533116 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1220533116, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1609789440).

1220533116 is an abundant number, since it is smaller than the sum of its proper divisors (1999045764).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1220533116 is a wasteful number, since it uses less digits than its factorization.

1220533116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1215 (or 1213 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 1220533116 is about 34936.1290929605. The cubic root of 1220533116 is about 1068.6853496408.

Adding to 1220533116 its reverse (6113350221), we get a palindrome (7333883337).

The spelling of 1220533116 in words is "one billion, two hundred twenty million, five hundred thirty-three thousand, one hundred sixteen".